Dynamic instability of delaminated composite skew plates subjected to combined static and dynamic loads based on HSDT

This study deals with the effects that various parameters have on the dynamic stability of delaminated composite skew structures under various periodic in-plane loads, based on the higher-order shear deformation theory (HSDT). The upper and lower boundaries of the instability regions are determined using the method suggested by Bolotin. The numerical results obtained for square and skew plates without delamination are in good agreement with those reported by other researchers. The behavior of laminated skew plate structures with various delamination sizes was also investigated to study the interactions between the skew angle and other various parameters such as, the delamination size and the fiber angle of each layer. The effect of the magnitude of static and dynamic in-plane loads on the dynamic instability region is also analyzed.